Andreas S. Kronfeld
(Fermilab)
15/06/2010, 14:30
Weak decays and matrix elements
We present an update of our calculation of the form factor for $B\to D^* l \nu$ at zero recoil, with higher statistics and further, finer, lattices. As before, we use the Fermilab action for $b$ and $c$ quarks, the asqtad staggered action for light valence quarks, and the MILC ensembles for gluons and light quarks (L\"uscher-Weisz married to 2+1 rooted staggered sea quarks).
Heechang Na
(The Ohio State University)
15/06/2010, 14:50
Weak decays and matrix elements
We investigate D to Kl\nu semi-leptonic decays using HISQ light and charm quarks on the MILC coarse and fine lattices.
Using PCVC allows us to extract the form factors with no need for operator renormalization.
We employ random-wall sources and simultaneous multi-T fits, in order to reduce the statistical errors.
By caring out consistency checks, we successfully re-produce all meson...
Stefano Di Vita
(University of Rome III and INFN - Roma Tre)
15/06/2010, 15:10
Weak decays and matrix elements
We present lattice results for the form factors relevant in the
D -> pion and D -> K semileptonic decays obtained from simulations
with two flavors of dynamical twisted-mass fermions.
Results at four values of the lattice spacing, ranging from ~ 0.05
up to ~ 0.1 fm, allow a careful study of the discretization effects.
The application of Heavy Meson Chiral Perturbation Theory provides
an...
Elvira Gamiz
(Fermilab)
15/06/2010, 15:30
Weak decays and matrix elements
The experimentally measured rates of the semileptonic decays K to pi l nu and D to K(pi) l nu can be combined with lattice calculations of the associated form factors to precisely extract the CKM matrix elements |V_{us}| and |V_{cs(d)}|. We report on the status of form factor calculations with Fermilab charm quarks and staggered light quarks on the 2+1 flavor asqtad staggered MILC ensembles....
Lorenzo Orifici
(University of Rome III and INFN - Roma Tre)
15/06/2010, 15:50
Weak decays and matrix elements
We investigate the form factors relevant in the K -> pion semileptonic decays using maximally twisted-mass fermions with two flavors of dynamical quarks.
The simulations cover pion masses as light as 260 MeV and four values of the lattice spacing, from ~ 0.05 up to ~ 0.1 fm, which allow to compute accurately the continuum limit.
SU(2) Chiral Perturbation Theory is applied to the...
